Insecticide



UNITED STATES msso'non'ir:

Vivian and Herbert L. J. Haller, Waslb D. 0., dedicated 1 linkage, thatis, by the 1 Patented ca. 12, 1931 Donald L.

ington,

PATENT OFFICE.

to the free use of the Public in the, t erritory of the United StatesAmerica No Drawing.

Application June 27. 1936, 9

Serial No. 87,745 i 5 Claims.

(Granted under the act of March 3, 1883, as

amended April 30, ,This application is made under the act of x March 3,1883, as amended by the act of April 130, .1928, and the inventionherein described, if patented, may be manufactured and used by or forthe Government for governmental purposes without'the'payment to us ofany royalty thereon.

' We hereby dedicate the invention herein del scribed to the free use ofthe public in the territory of the United States of America to take mefiect upon the granting of a patent to us.

This invention relates to improvements in materials for destroying orchecking the growth or multiplication of living organisms, whether plantor animal, which are economically injurious to n. An object of theinvention is to provide materials suitable for use as insecticides.

Another object of the invention is to provide a material for dusting orspraying delicate vegetation such as bean plants, peach trees, and

plants grown under glass, which will not cause injury to, foliage.

Another object of the invention is to provide material which isrelatively non-toxic to man and domestic animals when taken by mouth,and which can be used in place of lead arsenate and other arsenicals fordestroying insects without leaving harmful residues on fruits and vege-Q tables.

We have found that substances belonging to a certain class of organiccompounds have a specific toxic effect upon harmful insects, and ourinvention consists in p-(p-bromophenylazo)-phenolp-(2,5-dichlorophenylazo)-phenol l the application of said .35substances to the destruction of insect pests p-(p-iodophenylazo)-phenol4-(pbromophcnylazo)-3-ch1orophenol p-(bromophenylazo)-resorcinol tainone or more halogen atoms. Variations in the methods of preparation canbe readily made by one skilled in theart, but these methods do notaffect the novel features claimed.

For specific examples of the toxicity of these compounds it may bestated that when p-(pbromophenylazo)-phenol was dissolved in acetone andthe resulting solution poured into water there resulted a m'ortalityofculicine mosquito larvae within 16 hours when the concentration of theazo compound was one part to 500,000 parts of water.

When 4-(p-bromo henylazo)-resorcinol was dissolved in acetone and theresulting solution poured into water thereresulted a 10% mortality ofculicine mosquito larvae within 16 hours when the concentration of the9.20 compound was one part to 700,000 parts of water.

* When 4 -(2,5-dichlorophenylazo)-phenol was dissolved in acetone andthe resulting solution poured into water there resulted an 87% mor- Theabove examples are not to be construed as limiting either the method ofapplication of these novel insecticides or the kinds oi insects to whichthey may be applied.

These aryl hydroxyazo compounds may be applied in a manner similar tothat in which insecticides in general use are used, that is, as dusts,or in the form or solutions or suspensions in vari- 10 ous media, suchas water. kerosene, etc., and either with or without the use orspreaders, wetting agents. or sticking agents.

Having thus described our invention we claim:

1. An insecticide comprising an aryl hydroxy I 5 aao compound in whichthe nuclei are substituted DONALD L. VIVIAN.

: w n J. HALLER.

